Alendronate and ibandronate are drugs classified as because they decrease the release of an enzyme that causes bone cell breakdown.

Bone resorption inhibiting drug. This drug inhibits bone resorption  by decreasing the enzyme that causes bone cell breakdown. This will help in the formation of bone and the deposition of calcium. Typically this drugs are called bisphosphonates and used in osteoporosis. Stomach pain, diarrhea and constipation can be noted as side effects of the drugs. Precautions must be made if the patient is allergic to the drug or if there are history of difficulty in swallowing, hypocalcemia and intestinal disorder.

Alendronate  and  ibandronate  are   drugs  classified   as  bone  reabsorption  or   resorption   inhibitor   drug  classification.  Bone   resorption  inhibitors  drugs  are  drugs  that  inhibits  mineralization    or   resorption   of  the  bone  by  blocking   the action   of  osteoclasts.  They  are  used  to  treat  postmenopausal  and  glucocorticoid  induced   osteoporosis  and  pagets   disease  of  the  bone.

The correct answer is  b)